What was the last year pennies had copper in them?

Lincoln cents still have copper in them, but it's a very small amount only .025 copper & .975 zinc. 1981 is the last year all Lincoln cents were made of mostly copper (.950 & .050 zinc) and then in 1982 the Mint issued Lincoln cents made from both compositions. The copper coins weigh 3.11 grams. The zinc coins weigh 2.5 grams.